I have a lighting problem. My pool is very old as you can see in my signature. I had it refinished about 15 years ago and being that I had a 120V lamp and it was badly corroded, I had the contractor remove the old light. He cut the cable and tossed it, leaving only the rusted niche. Big mistake! Now, I want to replace it but I don't know where to begin. I figured I'd add a 12v transformer and put a sealed LED lamp in there rather than trying to replace the old niche but the first problem I ran into is that I can't remove the old cable going up to the deck through the conduit. I removed the deck plate and disconnected and capped off the mains but the conduit seems full of corrosion and god knows what kind of muddy funk that won't let me pull the cable out. You can feel a 90° bend where the cable comes into the niche in the pool but it won't budge. Help!